Auerswald COMpact 5200 Advanced Information page 499

SIP port (1 to 65535)
The SIP port on the PBX is used both as an incoming port and an outgoing
port (i.e. for communications with the VoIP provider).
Notes:
A different SIP port must be used for each VoIP provider.
The SIP port for a VoIP provider cannot be the same as the Port SIP du
registre VoIP interne or the Port SIPS du registre VoIP interne.
The Synthèses > Ports page shows an overview of the PBX ports
(incoming and outgoing).
SIP session timer (5 to 60 min.)

At the specified intervals, the SIP session timer checks whether the
connection is still present. (The PBX cannot detect whether a call
connection is disrupted due to problems on the provider side.)
Note: When the SIP session timer is switched on, this may result in the
call being interrupted more frequently after the specified interval, if a
VoIP provider has not implemented session renewal properly. In this
case, you should adjust the interval of the SIP session timer or switch it
off.
COMpact 5200/5200R/5500R - Firmware V7.2 - Advanced Information V04 07/2018
Settings – Réseaux publics
Voix sur IP (VoIP)
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